Photopolymerization type photosensitive lithographic printing plate precursor

Active Publication Date: 2008-04-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] According to the present invention, a photopolymerization type photosensitive lithographic printing plate precursor can be provided, which is suitable for conducting drawing with a laser beam and suitable f

Problems solved by technology

However, when an image is drawn on such a photosensitive lithographic printing plate precursor with a laser beam, a region of insufficient polymerization is formed in the edge of image due to an inadequate exposure amount depending on an energy distribution profile of the laser beam.
Thus, sharpness of the edge of image is impaired, resulting in decrease in resolution.
Also, in the region of insufficient polymerization formed in the edge of image, defect of removal occurs depending on alkali concentration of a developer or condition of a developing brush in a development processing step to cause a large variation of halftone dot area in a printing plate formed.
Moreover, since such a lithographic printing plate precursor comprises a support having a roughened surface according to electrolytic treatment or brush treatment in order to ensure hydrophilicity, image quality and sharpness are additionally injured and reproducibil

Method used

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  • Photopolymerization type photosensitive lithographic printing plate precursor
  • Photopolymerization type photosensitive lithographic printing plate precursor
  • Photopolymerization type photosensitive lithographic printing plate precursor

Examples

Experimental program
Comparison scheme
Effect test

Example

Support Example 1

(Support 1: Anodized Aluminum Support)

[0163] A 0.30-mm thick aluminum plate of 1S material was grained at the surface thereof using a No. 8 nylon brush and an aqueous suspension containing 800-mesh pumice stone, and then thoroughly washed with water. The plate was immersed in a 10% sodium hydroxide aqueous solution at 70° C. for 60 seconds to etch, followed by washing with running water, neutralizing with 20% HNO3 aqueous solution, and then washing with water. The plate was then subjected to the electrolytic surface roughening treatment in a 1% nitric acid aqueous solution under the condition of VA=12.7 V at an anodic time electricity of 300 Coulomb / dm2 using a current having an alternating sine wave form. The surface roughness was measured and found to be 0.45 μm (in terms of Ra). Subsequently, the plate was immersed in a 30% H2SO4 aqueous solution to desmut at 55° C. for 2 minutes. Then, the plate was anodized in a 20% H2SO4 aqueous solution of 33° C. at an elec...

Example

Comparative Example 1

[0171] A lithographic printing plate precursor was prepared in the same manner as in Example 1 except for eliminating Aurin as the yellow dye and evaluated in the same manner as described above. The results obtained are shown in Table 2. TABLE 2AbsorptionEvaluation ofEvaluationMaximumUnevenness ofof SpreadingWavelengthAmountHalftone dotof ShadowYellow Dye or Pigment(nm)added(δ dot)AreaExample 1Aurin4590.05 parts2.598%by weightExample 2Disperse Yellow 33670.05 parts2.098%by weightExample 34-Hydoxyazobenzene-2′-carboxylic4320.05 parts2.099%acidby weightExample 4Novoperm Yellow H2G (25% MEK4550.20 parts1.599%dispersion)by weightExample 5Seikafast Yellow 2200 (25% MEK3880.20 parts2.098%dispersion)by weightExample 6Seikafast Yellow 2400B (25% MEK3720.20 parts1.598%dispersion)by weightExample 7HOSTACOPY Y501 (25% MEK4400.20 parts2.099%dispersion)by weightComparativeNone——6.595%Example 1

[0172] From the results shown in Table 2, it can be seen that by the addition of ...

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Abstract

A negative-working photopolymerization type photosensitive lithographic printing plate precursor for exposing with laser, includes: a hydrophilic support; at least one photopolymerizable photosensitive layer; and a protective layer, provided in this order, wherein the photopolymerizable photosensitive layer contains a sensitizing dye, a dye or pigment capable of absorbing light having a wavelength of a laser emission wavelength ±50 nm, which is different from the sensitizing dye; and a photopolymerization initiator.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a photopolymerization type photosensitive lithographic printing plate precursor, and more particularly to a photopolymerization type photosensitive lithographic printing plate precursor suitable for conducting drawing with a laser beam and suitable for high definition AM screen printing of screen line number of 200 or more or FM screen printing. BACKGROUND OF THE INVENTION [0002] Heretofore, a lithographic printing plate precursor comprises a photosensitive resin layer provided on a support having a hydrophilic surface. As for the plate-making method thereof, the lithographic printing plate precursor is ordinarily subjected to floodwise exposure (mask exposure) via a lith film and then removal of the non-image area with a developer to obtain a desired printing plate. However, with the recent progress of digitized techniques, a computer-to-plate (CTP) technique of directly conducting exposure process on the surface of the...

Claims

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Application Information

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IPC IPC(8): G03C1/00
CPCG03F7/033G03F7/031
Inventor KAWAUCHI, IKUO
Owner FUJIFILM CORP
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